Vegetative organ structures of Ranunculaceae in Northeastern China and notes on systematic implications

doi:10.11686/cyxb20140307

Abstract

Abstract: The vegetative organ structures of 17 genera, 27 species and 4 varieties of Ranunculaceae from northeastern China have been deeply studied for the first time using both the glycol methacrylate method (GMA) and peeling of the leaf epidermis. The vegetative organ features, such as root, stem, leaf cuticle, stomata, petiole shape in transverse section and aerenchyma, have important systematic values. The thick cuticle found in Thalictrum is not present in other species. Stoma distribution is the same in the taxa within a genus, but differs between genera. Aerenchyma occurs in the cortex of roots and stems of Ranunculus. Petiole shapes in transverse section are similar in the taxa of the genus. The study supports the three genera Ranunculus, Batrachium and Halerpestes and they were placed in Ranunculus sensu lato since they have similar structures, e.g. their roots have lysigenous aerenchyma, vessels are present in bundles, and there is no secondary xylem. Caltha and Trollius have different cortical structures in the roots and different stomata distribution. Our study provides the morphological evidence for the molecular systematics that placed the two genera in different groups.

CLC Number:

Q944

CHENG Xin-yu,LIU Mei,ZHANG Xin-xin,WANG Chen,LI Bin-sheng. Vegetative organ structures of Ranunculaceae in Northeastern China and notes on systematic implications[J]. Acta Prataculturae Sinica, 2014, 23(3): 62-74.

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